Maine drinking water quality
Maine has 1,869 active public water systems serving 939K people. 1,141 of them, 61%, had at least one EPA violation in the past three years, 497 have an unresolved violation today, and 42 are designated serious violators by the EPA.
Active systems
1,869
in 16 counties
People served
939K
386 community systems serve 692K
Violations, past 3 years
1,141
61% of active systems
Serious violators
42
47 systems carry a health flag
Largest counties
All 16 counties| County | People served | Systems | With violations |
|---|---|---|---|
| Cumberland | 217,855 | 226 | 144 |
| York | 165,002 | 188 | 100 |
| Penobscot | 92,670 | 170 | 115 |
| Kennebec | 79,860 | 169 | 82 |
| Androscoggin | 70,185 | 94 | 51 |
| Hancock | 47,162 | 206 | 133 |
| Oxford | 40,723 | 134 | 77 |
| Aroostook | 40,688 | 124 | 97 |
| Somerset | 34,437 | 100 | 72 |
| Knox | 30,632 | 46 | 22 |
Largest community water systems
All 1,869 systems| System | Serves | Status |
|---|---|---|
| Portland Water District-Greater Cumberland County |
135,068 | |
| Maine Water Company Biddeford Saco Div York County |
42,508 | |
| Kennebunk, Kennebunkport & Wells WD York County |
35,663 | |
| Bangor Water District Penobscot County |
27,298 | |
| Lewiston Water & Sewer Division Androscoggin County |
23,720 | |
| Kennebec Water District Kennebec County |
22,060 | |
| Maine Water Company Camden & Rockland Knox County |
21,315 | |
| Brunswick/topsham Water District Cumberland County |
18,863 | |
| Auburn Water District Androscoggin County |
17,245 | |
| Kittery Water District York County |
14,478 |
About the Maine data
Retrieved from EPA ECHO on Oct 11, 2026.